<p>Boron isotope systematics of planktonic foraminifera from core-top sediments and culture experiments have been studied to investigate the sensitivity of δ<sup>11</sup>B of their calcite tests to seawater pH. However, our knowledge of the relationship between δ<sup>11</sup>B and pH remains incomplete for several taxa. Thus, to expand the potential scope of application of this proxy, we report data for 7 different species of planktonic foraminifera from sediment core-tops. We utilize a method for the measurement of small samples of foraminifera and calculate the δ<sup>11</sup>B-calcite sensitivity to pH for <i>Globigerinoides ruber, Trilobus sacculifer</i> (sacc or w/o sacc), <i>Orbulina universa, Pulleniatina obliquiloculata, Neogloboquadrina dutertrei, Globorotalia menardii</i> and <i>Globorotalia tumida</i>, including for unstudied coretops and species. The sensitivity of δ<sup>11</sup>B<sub>carbonate</sub> to δ<sup>11</sup>B<sub>borate</sub> (eg. Δδ<sup>11</sup>B<sub>carbonate</sub>/Δδ<sup>11</sup>B<sub>borate</sub>) in core-tops is close to unity. Deep-dwelling species closely follow the core-top calibration for <i>O. universa</i>, which is attributed to respiration-driven microenvironments, likely caused by light limitation for symbiont-bearing foraminifera. These taxa have diverse ecological preferences and are from sites that span a range of oceanographic regimes, including some that are in regions of air-sea equilibrium and others that are out of equilibrium with the atmosphere. Our data support the premise that utilizing boron isotope measurements of multiple species within a sediment core can be utilized to constrain vertical profiles of pH and pCO<sub>2</sub> at sites spanning different oceanic regimes, thereby constraining changes in vertical pH gradients and yielding insights into the past behavior of the oceanic carbon pump.</p>